Number of n X 2 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.
A268965
Number of n X 2 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.
Terms
- a(0) =9a(1) =60a(2) =336a(3) =1728a(4) =8448a(5) =39936a(6) =184320a(7) =835584a(8) =3735552a(9) =16515072a(10) =72351744a(11) =314572800a(12) =1358954496a(13) =5838471168a(14) =24964497408a(15) =106300440576a(16) =450971566080
External references
- oeis: A268965